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.TH "MONGOOPLOG" "1" "March 18, 2014" "2.6" "mongodb-manual"
.SH NAME
mongooplog \- MongoDB Oplog Utility
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New in version 2.2.

.SH SYNOPSIS
.sp
\fBmongooplog\fP is a simple tool that polls operations from
the \fIreplication\fP \fIoplog\fP of a remote server, and applies
them to the local server. This capability supports certain classes of
real\-time migrations that require that the source server remain online
and in operation throughout the migration process.
.sp
Typically this command will take the following form:
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mongooplog  \-\-from mongodb0.example.net \-\-host mongodb1.example.net
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.fi
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.sp
This command copies oplog entries from the \fBmongod\fP instance
running on the host \fBmongodb0.example.net\fP and duplicates
operations to the host \fBmongodb1.example.net\fP\&. If you do not need
to keep the \fI\-\-from\fP host running during
the migration, consider using \fBmongodump\fP and
\fBmongorestore\fP or another \fBbackup\fP operation, which may be better suited to
your operation.
.sp
\fBNOTE:\fP
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If the \fBmongod\fP instance specified by the \fI\-\-from\fP
argument is running with \fBauthentication\fP, then
\fBmongooplog\fP will not be able to copy oplog entries.
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.sp
\fBSEE ALSO:\fP
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\fBmongodump\fP, \fBmongorestore\fP,
http://docs.mongodb.org/manual/core/backups, http://docs.mongodb.org/manual/core/replica\-set\-oplog\&.
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.SH OPTIONS
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.TP
.B mongooplog
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.TP
.B mongooplog
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.B \-\-help, \-h
Returns information on \fBmongooplog\fP options and usage.
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.TP
.B \-\-verbose, \-v
Increases the amount of internal reporting returned on standard output
or in log files. Increase the verbosity with the \fB\-v\fP form by
including the option multiple times, (e.g. \fB\-vvvvv\fP\&.)
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.TP
.B \-\-quiet
Runs \fBmongooplog\fP in a quiet mode that attempts to limit the amount of
output. This option suppresses:
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.IP \(bu 2
output from \fIdatabase commands\fP
.IP \(bu 2
replication activity
.IP \(bu 2
connection accepted events
.IP \(bu 2
connection closed events
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.B \-\-version
Returns the \fBmongooplog\fP release number.
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.B \-\-host <hostname><:port>, \-h
Specifies a resolvable hostname for the \fBmongod\fP instance to
which \fBmongooplog\fP will apply \fIoplog\fP operations
retrieved from the server specified by the \fI\-\-from\fP option.
.sp
By default \fBmongooplog\fP attempts to connect to a MongoDB instance running
on the localhost on port number \fB27017\fP\&.
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To connect to a replica set, specify the replica set seed name and the
seed list of set members. Use the following format:
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.nf
.ft C
<replica_set_name>/<hostname1><:port>,<hostname2:<port>,...
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.fi
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You can always connect directly to a single MongoDB instance by
specifying the host and port number directly.
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.B \-\-port
Specifies the port number of the \fBmongod\fP instance where
\fBmongooplog\fP will apply \fIoplog\fP entries. Specify
this option only if the MongoDB instance to connect to is not
running on the standard port of \fB27017\fP\&. You may also specify a
port number using the \fI\-\-host\fP command.
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.B \-\-ipv6
Enables IPv6 support, which allows \fBmongooplog\fP to connect to the MongoDB
instance using an IPv6 network. All MongoDB programs and processes,
including \fBmongooplog\fP, disable IPv6 support by default.
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.B \-\-ssl
New in version 2.6.

.sp
Enables connection to a \fBmongod\fP or \fBmongos\fP that has
SSL support enabled.
.sp
The default distribution of MongoDB does not contain support for SSL.
For more information on MongoDB and SSL, see http://docs.mongodb.org/manual/tutorial/configure\-ssl\&.
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.B \-\-sslCAFile <filename>
New in version 2.6.

.sp
Specifies the \fB\&.pem\fP file that contains the root certificate chain
from the Certificate Authority. Specify the file name of the
\fB\&.pem\fP file using relative or absolute paths.
.sp
The default distribution of MongoDB does not contain support for SSL.
For more information on MongoDB and SSL, see http://docs.mongodb.org/manual/tutorial/configure\-ssl\&.
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.B \-\-sslPEMKeyFile <filename>
New in version 2.6.

.sp
Specifies the \fB\&.pem\fP file that contains both the SSL certificate
and key. Specify the file name of the \fB\&.pem\fP file using relative
or absolute paths.
.sp
This option is required when using the \fI\-\-ssl\fP option to connect
to a \fBmongod\fP or \fBmongos\fP that has
\fBsslCAFile\fP enabled \fIwithout\fP
\fBsslWeakCertificateValidation\fP\&.
.sp
The default distribution of MongoDB does not contain support for SSL.
For more information on MongoDB and SSL, see http://docs.mongodb.org/manual/tutorial/configure\-ssl\&.
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.B \-\-sslPEMKeyPassword <value>
New in version 2.6.

.sp
Specifies the password to de\-crypt the certificate\-key file (i.e.
\fI\-\-sslPEMKeyFile\fP). Use \fI\-\-sslPEMKeyPassword\fP only if
the certificate\-key file is encrypted. In all cases, \fBmongooplog\fP will
redact the password from all logging and reporting output.
.sp
If the private key in the PEM file is encrypted and you do not specify
\fI\-\-sslPEMKeyPassword\fP, \fBmongooplog\fP will prompt for a passphrase.
See \fIssl\-certificate\-password\fP\&.
.sp
The default distribution of MongoDB does not contain support for SSL.
For more information on MongoDB and SSL, see http://docs.mongodb.org/manual/tutorial/configure\-ssl\&.
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.B \-\-sslCRLFile <filename>
New in version 2.6.

.sp
Specifies the \fB\&.pem\fP file that contains the Certificate Revocation
List. Specify the file name of the \fB\&.pem\fP file using relative or
absolute paths.
.sp
The default distribution of MongoDB does not contain support for SSL.
For more information on MongoDB and SSL, see http://docs.mongodb.org/manual/tutorial/configure\-ssl\&.
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.B \-\-sslAllowInvalidCertificates
New in version 2.6.

.sp
Bypasses the validation checks for server certificates and allows
the use of invalid certificates. When using the
\fBsslAllowInvalidCertificates\fP setting, MongoDB logs as a
warning the use of the invalid certificate.
.sp
The default distribution of MongoDB does not contain support for SSL.
For more information on MongoDB and SSL, see http://docs.mongodb.org/manual/tutorial/configure\-ssl\&.
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.B \-\-sslFIPSMode
New in version 2.6.

.sp
Directs \fBmongooplog\fP to use the FIPS mode of the installed OpenSSL
library. Your system must
have a FIPS compliant OpenSSL library to use \fI\-\-sslFIPSMode\fP\&.
.sp
The default distribution of MongoDB does not contain support for SSL.
For more information on MongoDB and SSL, see http://docs.mongodb.org/manual/tutorial/configure\-ssl\&.
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.B \-\-username <username>, \-u
Specifies a username with which to authenticate to a MongoDB database
that uses authentication. Use in conjunction with the \fB\-\-password\fP and
\fB\-\-authenticationDatabase\fP options.
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.B \-\-password <password>, \-p
Specifies a password with which to authenticate to a MongoDB database
that uses authentication. Use in conjunction with the \fB\-\-username\fP and
\fB\-\-authenticationDatabase\fP options.
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.B \-\-authenticationDatabase <dbname>
New in version 2.4.

.sp
Specifies the database that holds the user\(aqs credentials.
If you do not specify an authentication database, \fBmongooplog\fP assumes
that the database specified as the argument to the \fI\-\-db\fP option
holds the user\(aqs credentials.
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.B \-\-authenticationMechanism <name>
New in version 2.4.

.sp
Specifies the authentication mechanism. By default, the authentication
mechanism is \fBMONGODB\-CR\fP, which is the MongoDB challenge/response
authentication mechanism. In MongoDB Enterprise, \fBmongooplog\fP also includes
support for \fBGSSAPI\fP to handle Kerberos authentication. See
http://docs.mongodb.org/manual/tutorial/control\-access\-to\-mongodb\-with\-kerberos\-authentication
for more information about Kerberos authentication.
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.B \-\-dbpath <path>
Specifies a directory, containing MongoDB data files, to which
\fBmongooplog\fP will apply operations from the \fIoplog\fP of
the database specified with the \fI\-\-from\fP
option.
.sp
When used, the \fI\-\-dbpath\fP option enables \fBmongo\fP to
attach directly to local data files and write data without a running
\fBmongod\fP instance.
.sp
To run with \fI\-\-dbpath\fP, \fBmongooplog\fP needs to restrict
access to the data directory: as a result, no \fBmongod\fP can be
access the same path while the process runs.
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.B \-\-directoryperdb
When used in conjunction with the corresponding option in
\fBmongod\fP, allows \fBmongooplog\fP to access data from MongoDB
instances that use an on\-disk format where every database has a distinct
directory. This option is only relevant when specifying the
\fI\-\-dbpath\fP option.
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.B \-\-journal
Allows \fBmongooplog\fP operations to use the durability \fIjournal\fP to
ensure data files remain valid and recoverable. This option is only
relevant when specifying the \fI\-\-dbpath\fP option.
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.B \-\-db <database>, \-d
Specifies the name of the database on which to run \fBmongooplog\fP\&.
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.B \-\-collection <collection>, \-c
Specifies the collection to export.
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.B \-\-seconds <number>, \-s
Specify a number of seconds of operations for \fBmongooplog\fP to
pull from the \fIremote host\fP\&. Unless
specified the default value is \fB86400\fP seconds, or 24 hours.
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.B \-\-from <host[:port]>
Specify the host for \fBmongooplog\fP to retrieve \fIoplog\fP
operations from. \fBmongooplog\fP \fIrequires\fP this option.
.sp
Unless you specify the \fI\-\-host\fP option,
\fBmongooplog\fP will apply the operations collected with this
option to the oplog of the \fBmongod\fP instance running on the
localhost interface connected to port \fB27017\fP\&.
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.B \-\-oplogns <namespace>
Specify a namespace in the \fI\-\-from\fP host
where the oplog resides. The default value is \fBlocal.oplog.rs\fP, which
is the where \fIreplica set\fP members store their operation log.
However, if you\(aqve copied \fIoplog\fP entries into another database or
collection, use this option to copy oplog entries stored in another
location. Namespaces take the form of \fB[database].[collection]\fP\&.
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.SH USE
.sp
Consider the following prototype \fBmongooplog\fP command:
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mongooplog  \-\-from mongodb0.example.net \-\-host mongodb1.example.net
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.fi
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.sp
Here, entries from the \fIoplog\fP of the \fBmongod\fP running
on port \fB27017\fP\&. This only pull entries from the last 24 hours.
.sp
Use the \fI\-\-seconds\fP argument to capture
a greater or smaller amount of time. Consider the following example:
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mongooplog  \-\-from mongodb0.example.net \-\-seconds 172800
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.fi
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In this operation, \fBmongooplog\fP captures 2 full days of
operations. To migrate 12 hours of \fIoplog\fP entries, use the
following form:
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.nf
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mongooplog  \-\-from mongodb0.example.net \-\-seconds 43200
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.fi
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.sp
For the previous two examples, \fBmongooplog\fP migrates entries
to the \fBmongod\fP process running on the localhost interface
connected to the \fB27017\fP port. \fBmongooplog\fP can also
operate directly on MongoDB\(aqs data files if no \fBmongod\fP is
running on the \fItarget\fP host. Consider the following example:
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mongooplog  \-\-from mongodb0.example.net \-\-dbpath /srv/mongodb \-\-journal
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.fi
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.sp
Here, \fBmongooplog\fP imports \fIoplog\fP operations from the
\fBmongod\fP host connected to port \fB27017\fP\&. This migrates
operations to the MongoDB data files stored in the \fB/srv/mongodb\fP
directory. Additionally \fBmongooplog\fP will use the durability
\fIjournal\fP to ensure that the data files remain valid.
.SH AUTHOR
MongoDB Documentation Project
.SH COPYRIGHT
2011-2014, MongoDB, Inc.
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